Income Taxes - Reorganization Transactions - (Details) - USD ($) $ in Thousands		12 Months Ended
	Apr. 01, 2016	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income taxes
Current tax receivables related to transactions prior to Reorganization Transactions		$ 93,100	$ 93,100
Unrecognized tax positions		118,100	117,300
Indemnification receivable		25,000	24,200
Total state and local distribution taxes reported		92,100
Capital Distributions				$ 2,118
Net adjustments to pre-reorganization indemnification receivables or payables and unrecognized tax benefits			$ 1,500	$ 3,900
Reorganization Transactions on April 1, 2016
Income taxes
Current tax receivables recorded	$ 72,800
Unrecognized tax positions	116,600
Indemnification payable	28,600
Certain tax related liabilities incurred	95,400
Expected federal tax benefit on distribution taxes	$ 33,400
Capital Distributions		$ 2,100